US 7,496,024 B2
Hologram apparatus and hologram recording method
Nobuhiro Kihara, Kanagawa (Japan); Hisayuki Yamatsu, Tokyo (Japan); and Megumi Ezura, Tokyo (Japan)
Assigned to Sony Corporation, Tokyo (Japan)
Filed on Jul. 11, 2005, as Appl. No. 11/177,429.
Claims priority of application No. 2004-205999 (JP), filed on Jul. 13, 2004.
Prior Publication US 2006/0013104 A1, Jan. 19, 2006
Int. Cl. G11B 7/00 (2006.01)
U.S. Cl. 369—103 20 Claims
OG exemplary drawing
 
1. A hologram apparatus for recording an interference fringe of a signal beam and a reference beam having a speckle pattern in a recording area of a hologram recording material, said hologram apparatus comprising:
speckle pattern generating unit for generating said speckle pattern so that said speckle pattern is different in form in the track direction and the cross-track direction of said recording area, said speckle pattern generating unit generating said speckle pattern such that said speckle pattern has a larger granular shape in said cross-track direction than in said track direction of said recording area.